_Stamp books_: Number issued, 1916 28,005,930 _Postal cards_: Number issued, 1916 1,047,894,800 Value $10,784,307.00 _Dead letters_: Letter and parcels received, 1916 10,839,890 Money value found in undelivered letters $2,303,119.56 Net revenue from sale of undeliverable articles $53,665.69 _Mail bags_, 1916: Number pouches available 600,000 Number sacks available 4,000,000 Cost of pouches $0.70 Cost of catcher pouches .80 _Mail locks_, 1916: Number general mail locks in use 1,000,000 Cost, each 8½ cents; to repair, 3 cents _Division of supplies_: Appropriation, blanks, stationery, etc., 1916 $2,500,000.00 _Special delivery_: Amount expended for service, 1916 $633,713.21 Number of pieces delivered yearly 32,000,000 _Railway mail service_, 1916: Number of clerks 19,000 Number of mail routes 3,500 Salaries paid $26,000,000.00 Correct handling of mail 99.984 per cent Cost of transportation $57,900,000 _Star routes_: Number, 1916 11,187 Length of miles 147,167 Average cost per mile, length $54.16 Average cost per mile of travel $0.1026 Annual cost $7,726,975.00 Routes on which there is found rate service 195 Number pounds carried, 1917 23,411,604 Cost $280,738.08 Cost per hundred pounds $1.20 Number of Star routes discontinued on account of rural delivery service from Jan., 1904, to June, 1917 7,450 Cost $2,577,728 Length in miles 72,340 1900 1917 Number of routes 22,834 11,208 Cost mile of length $19.02 $54.56 Cost mile of travel 3.83 cents 10.24 cents Cost per route $224.81 $723.00